gilbert



(No Model.) Q 2 Sheets-Sheet 1. J. GILBERT.

' FURNACE. No. 393,005. Patented NOV. 20, 1888.

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J. GILBERT.

FURNACE.

(No Model.)

Patented Nov. 20, 1888.

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PATENT O FICE.

JAMEs GILBERT, OF OMAHA, NEBRASKA, AssIeNoBoE ONE-HALF TO CHARLES E. LEE,

OF SAME PLACE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 393,005, dated November 20,1888.

Serial No.266.079. (No model.)

To all whom, it may concern:

Be it known that 1, JAMES GILBERT, a citizen of the United States, residing at Omaha, in the county ofDouglas and State ofNebraska, have invented certain new and useful Improvements in Boiler and other Analogous Furnaces. of which the following is a specification.

The object of this invention is, in furnaces for boilers and analogous heating with bituminous coal or other rich carbons, to supply a special additional and heated current of air or oxygen to the products of combustion from the grate before entering the final combustionchamber of such furnace, to cause more complete combustion of such products, thereby producing more effective and powerful heat to generate the steam or gas in a retort, or more heat for analogous purposes.

In the annexed drawings, Figure 1 represents a longitudinal central vertical section of a boiler-furnace constructed according to my invention. Fig. 2 is a horizontal section of the same, the section being taken partly through the bridge-wall, omitting the boilerf and partly at the forward part of the furnace through the boiler. Fig. 3 is a vertical lateral section of the same, the section being taken through the grate and fire-box. Fig. 4 is a similar lateral section of the same, the section being taken through the bridge-wall and its fines.

A represents a tubular horizontal boiler.

B is the grate; C, the ash-pit of the boilerfurnace.

D represents the front wall.

E E are the side walls; F, the rear wall; G,

the so-called bridge-wall of the furnace.

H represents the fire-door; I, the ash-pit door.

Over the boiler the furnace is built and arched over from side wall to side wall and from front to rear wall, inclosing with the iron front J the boiler, except its dome K, which projects above the furnace. The bridge-wall G of this furnace is built entirely up from the bottom of the ash-pit to meet the bottom portion of the boiler and connect from side wall to side wall, leaving no space between the side walls and bridge-walland bottom and side of the boiler in contact with them. The space P between the grate, the side walls, and bottom half of the boiler periphery is made of the usual dimension for the proportional grate and heating surface of the fire-box with the boiler.

The ash-pit is of the usual proportional dimension. A proportional large space is provided from the rear side of the bridge-wall along between the side walls and between the rear wall and the bottom and the rear end of the boiler for a final c0mbustion-chamber, L, of the furnace. From this combustion-chamber the products of combustion pass, as usual, through the boilertubes into the smoke-box M, from which they escape into the chimney N.

The bridge-wall G has several longitudinal flue-passages, O 0, from the fire-box or space P into the chamber L. Each side wall is built partly hollow to form an air-flue passage, Q, which has first a horizontal portion, a, allowing the air to enter at the front of the furnace. Connected with said portion a of said flue is a secondary vertical portion, 1), about opposite the rear portion of the firebox, descending until about opposite grate, and there connecting with a horizontal and third portion, 0, passing rearward until nearly opposite the rear end of the boiler, and there connecting with a fourth portion, (1, ascending vertically to about opposite the central portion of the boiler, and meeting and connecting with a fifth portion, 6, of said flue, passing horizontally forward until about opposite the bridge-wall of the furnace. From said fifth portion 6 a sixth portion, f, descends vertically until connecting and conducting the air from each side wall into a common central lateral flue, R, which is located horizontally inthe bridge-wall below the passages O 0, before mentioned, and from said flue R is made for each passage 0 a vertical connecting small flue, S, with said passage 0. The third portions, 0 e, of the flue Q of each side wall are connected by a'horizontal lateral common fine, T, connecting them and passing under the bottom of the rear portion of the combustionchamber L, and a third lateral common flue, U, is also provided between the fourth portion, (1, of the fines Q of the side walls.

From the foregoing it will be seen that when the furnace is in operation andthe bituminous coal or rich carbon in the fire-box is in a'partlv burning, partly-distilling, and partly-deeomposing condition all products of combustion are conducted through the passages O 0. By

- the flues Q, the cold air entering through flue portions a passes through flue portionsb at the sides of the firebox and becomes heated and passes through-the flue portions 0 and d, there becomes more heated, the sides and bottom of the combustion-chamber L being very hot, said air finally passing into the flueRand through the flues S into the said passages O at a highlyheated temperature, meeting and mixing with the said products of combustion from the firebox and furnishing an additional supply of hot oxygen, and both together passing into the final combustion-chamber L for a much more complete combustion and producing a high incandescent flame, with nearly all smoky vapors consumed and decomposed, imparting a high heat to effect a powerful generation of the steam with not only the advantage of producing the powerful heat, but also, by avoiding the coating by lamp-black of the boiler-tubes, effecting a powerful imparting of the heat to the water or body to be heated. The side walls,

E, and rear wall, F, have across the flues Q a binding-brick or other suitable binding device to combine the walls laterally.

What I claim as my invention, and desire to secure by Letters Patent, is r In furnaces for boilers, the construction of 0 the furnace with a lateral bridge-wall, G, between and completely dividing the fuel-chamber or box Pfrom the combustion-chamber L, except the several direct smoke-communicating flues O O, in combination with special air-flues Q, having their entrance direct into the side walls at the front and passing along the sides of the fire-box in said walls, then passing rearward, as described, and at a level below the flue R, and there meeting the lateral flue T at the rear of the combustion-chamber, thence passing through the rear of side walls forward and meeting a lateral flue, R, in the bridge-wall, which connects with said lines 0 O by means of vertical flues S, substantially as and for the purpose herein shown and set forth.

In testimony whereofI hereunto set my hand this 27th day of February, 1888.

JAMES GILBERT.

ln presence of- \V. S. WRIGHT,

R. BOEKLEN. 

